18403345 has 4 divisors (see below), whose sum is σ = 22084020. Its totient is φ = 14722672.

The previous prime is 18403337. The next prime is 18403351. The reversal of 18403345 is 54330481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54330481 = 19 ⋅2859499.

It can be written as a sum of positive squares in 2 ways, for example, as 2650384 + 15752961 = 1628^2 + 3969^2 .

It is a cyclic number.

It is not a de Polignac number, because 18403345 - 2³ = 18403337 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1840330 + ... + 1840339.

It is an arithmetic number, because the mean of its divisors is an integer number (5521005).

Almost surely, 2^18403345 is an apocalyptic number.

It is an amenable number.

18403345 is a deficient number, since it is larger than the sum of its proper divisors (3680675).

18403345 is an equidigital number, since it uses as much as digits as its factorization.

18403345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3680674.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 18403345 is about 4289.9120037595. The cubic root of 18403345 is about 264.0172212901.

The spelling of 18403345 in words is "eighteen million, four hundred three thousand, three hundred forty-five".